Lubricant



. Thus, for example, it

': vide a hydrocarbon pale oil: an antioxidant, for example,

Patented Feb. 10, 1948 UNITED. s'rA'rss PATENT OFFICE I Herbert D. ault, Whit cago, Ili., Chicago,

No Drawing.

The present invention relates to improvements in hydrocarbon oil compositions and more particularly relates to stable, corrosion inhibiting hydrocarbon oil compositions.

It is known to incorporate in hydrocarbon oil compositions certain types of additives to impart to the hydrocarbon oil compositions certain desired properties. Thus, for example, certain types incorporated in hydrocarbon oil compositions to impart oxidation stability and others are added to impart to such oil compositions rust and/or corrosion inhibiting properties. is known to incorporate in turbine oils known antioxidants such as betanaphthol to improve the oxidative stability of the oils. It is also known, for example, to add to turbine oils a corrosion inhibitor such as stearic acid to impart to the turbine oil rust inhibiting properties. However, it has been observed that frequently the addition of one type of additive affects the effectiveness of other additives which may be present'in the oil. a

It is an object of the present invention to prooil composition containing in combination several types of compounds, each of which imparts a synergistic erfect'upon the other.

It is anotherobiect of the a turbine oil resistant to oxidative deterioration and which is effective in inhibiting rusting and/or corrosion.

We have discovered that the foregoing objects can be obtained by incorporating in combination the following additives to hydrocarbon oil, particularly a mineral oil whether highly refined or from about 0.001% to about 0.1% and preferably from about 0.01% to about 0.1% of an hydroxy condensed ring compound or alkyl derivatives thereof such as, for example, beta-naphthol. octyl beta-naphthol, amyi beta-naphthol, alpha-naphthol, cetyl alpha-naphthol and other alkyl derivatives of beta-naphthol about 0.001% to about 3% and preferably from about 0.01%. to about 0.2% of N-phenyl-alphanaphthylamine, from about 0.0005% to about 0.5% and preferably from about 0.001% to about 0.05% of a fatty acid, particularly stearic acid as corrosion and/or rust inhibitor-s, and from about 0.0005% to about 1% and preferably from about 0.001% to about 0.05% of an hydroxamic acid compound having the general formula:

B-g-N OY ing, lnd., an

Rhodes, Tucson,

invention to provide 1 characteristics although very d Ciaron N. White, Chiassignors to Standard Oil Company, 1il.,'a corporation of Indiana AppiicationJune 29, 1944, Serial No. 542,816

3 Claims. (Cl. 252-515) Ariz., George F. Ronin which R is a substituent selected from the class consisting of hydrogen, alicyclic radicals, saturated aliphatic radicals, and mono-unsaturated aliphatic radicals, and Y is a substituent the class consisting of H, N114 and amine substituents. The alicyclic radical is pref erably a. naphthene radical. The naphthenes are cyclo paraflins consisting of. one or more cyclo' paraffin rings substituent groups. The mono-unsaturated aliphatic radical is an unsaturated aliphatic radical containing only one ethylene linkage. The amine substituent can be a primary, secondary or tertiary mono-amine or a polyamine, or the corresponding substituted amines, preferably the alkyl substituted amines. I

Examples of specific compounds coming within the foregoing formula are: naphthenohydroxamic acids, iaurohydroxamic acid, behenhydroxamic myristhydroxamic acid, oleohydroxamic acid, ammonium salts of these hydroxamic acids, and the amine salts of hydroxamic acid, such as the amyl acid, lauryldiamine salt of naphthenohydroxamic acid and the like.

Each of the aforementioned components is a necessary constituent product having the optimum oxidation and rust inhibiting nets are obtained by employing either N-phenylalpha-naphthylarnine' or the naphthol antioxidants, for example beta-naphthol and/or octyl beta-naphthol.

and alpha-naphthol, and/or from i For the purpose of exemplifying the present invention, the same will be discussed as applied to steam turbine lubrication for which highly refined oils having Saybolt Universal visoosities at F. of from seconds are employed, stood that the invention embodiment. treatments to produce more highly refined turbine oils having improved color, sludge resistance, and emulsification properties, the desirable components of the oils responsible for preventing the oxidative deterioration of the oils and those compounds responsible for the wetting and therefore rust inhibiting qualities of the oil are removed. To overcome the susceptibility of such oils to oxidative deterioration, antioxidants are'usually employed. While the addition of such antioxidants inhibits the oxidation of such oils, the rust inhibiting properties of the oils are not affected. In steam turbines rusting is usually encountered in the upper portions of the oil reservoirs and amine salt of naphthenohydroxamic Universal viscosity at 100 F. of about 160 seconds was compounded with 0.05%

0.025% N-phenyI-alpha-naph- Oil Life in Hours A Control 210 B Control+0.01% naphthenohydroxamic acid+ 0.01% stearic acid 145 C Control+0.2% N-phenyl-alpha-naphtbylamine. 270 D Control-+01% N-phenyl-alpha-naphtbylamine +0.01% naphthenohydroxamic acid 450 E Oil D+0.0i% stearic acid 670 Gal Number about 0.0005.% to about 1% naphthenohydroxamic acid. j 3. A turbine oil resistant to oxidative deteriora- REFERENCES CITED The following references are file of this patent:

UNITED STATES PA ENTS Name Date Rocchini 'Nov. 4, 1941 Dietrich Apr. 14,- 1942 Dietrich Apr. 14, 1942 Cook May 5, 1942 Van Ess July 4, 1944 6: more in the 

